Joining of ceramics for advanced heavy-duty diesels
The wettability and adherence in vacuum of a series of metal alloys on several oxide ceramics were investigated with the goal of identifying those compositions suitable as filler metals for direct brazing of ceramics in uncooled diesel engine applications. Wetting behavior was determined by the sessile-drop technique. Adherence was measured by several tests including sessile-drop shear, flexure strength of ceramics brazed in a butt-joint configuration, fracture toughness using a composite double cantilever beam specimen, and, in the case of ceramic-metal brazements, by a bar/pad shear test. Compositions were identified in both the Cu-Ag-Ti and Cu-Au-Ti ternary systems that wet and strongly adhered to high-purity aluminas, partially stabilized zirconia ceramics, and alumina reinforced with SiC whiskers. Excellent flexural strengths, at temperatures up to 600/sup 0/C, of brazements containing these filler metals indicate that these materials are good candidates for use in advanced heavy-duty diesel engines. They have the advantage over competing systems of not requiring that the ceramic be metallized before brazing.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5601962
- Report Number(s):
- DOE/NASA-4148-1; ORNL-6262; NASA/CR-175019; ON: DE86011361
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ADHESION
ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BRAZED JOINTS
BRAZING
BRAZING ALLOYS
CERAMICS
CHALCOGENIDES
COPPER ALLOYS
DIESEL ENGINES
ENGINES
FABRICATION
FILLER METALS
GOLD ALLOYS
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
JOINING
JOINTS
MATERIALS
MECHANICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
SILVER ALLOYS
TITANIUM ALLOYS
TRANSITION ELEMENT COMPOUNDS
WELDED JOINTS
WELDING
WETTABILITY
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES